Precious

a.
  1. Of great price; costly; as, a precious stone.
  2. Of great value or worth; very valuable; highly esteemed; dear; beloved; as, precious recollections.
  3. Particular; fastidious; overnice; overrefined. Cf. Précieuse, Preciosity.
  4. Precious metals ,
    the uncommon and highly valuable metals, esp. gold and silver.
    Precious stones ,
    gems; jewels.